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采用电磁超声波技能器（EMAT）检测铁路货车铸铜车轮，和传统的超声波检测方法相比，有两大优点：（1）换能器和测试材料之间不需耦合剂，提高了检测精确度；（2）可实现检测作业的全自动化。
There are two advantages of EMAT in detecting cast iron wheels of railway wagons compared with the traditional ultrasonic testing methods: (1) no coupling agent between the transducer and the test material is needed to improve the detection accuracy ; (2) Fully automated inspection operations.